3 views

If $\vec{A}=x y \hat{a}_{4}+x^{2} \hat{a}_{3}$, then $\oint_{c} \vec{A} \cdot d \vec{l}$ over the path shown in the figure is

1. $0$
2. $\frac{2}{\sqrt{3}}$
3. $1$
4. $2 \sqrt{3}$